Force dialog/pop-up boxes always on top in desktop

I am using Windows 8 Pro 64-bit. In previous versions of windows, dialog boxes used to pop-up as required on top of other screens to indicate if there were problems or if action was needed (e.g. if you were copying a file from one location to another and if that file already existed there, you were asked what you wanted to do). However when at the desktop level of Windows 8, dialog...